:root { --ink: #1c2541; --muted: #5b6475; --accent: #203569; --bg: #ffffff; --card: #f5f7fb; --rule: #e3e7ef; }
@media (prefers-color-scheme: dark) { :root { --ink: #e8ecf5; --muted: #a7b0c2; --accent: #9db8ff; --bg: #0f1420; --card: #182033; --rule: #273149; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 56px 16px 48px; }
nav { display: flex; gap: 20px; margin-bottom: 30px; font-size: 0.95rem; }
nav a { color: var(--muted); text-decoration: none; display: inline-block; padding: 10px 0; }
nav a[aria-current="page"] { color: var(--ink); font-weight: 600; }
h1 { font-size: 2.1rem; line-height: 1.2; margin: 0 0 12px; }
h2 { font-size: 1.15rem; margin: 32px 0 8px; }
.lede { color: var(--muted); font-size: 1.15rem; margin: 0 0 32px; }
.card { background: var(--card); border-radius: 12px; padding: 24px; margin: 0 0 24px; }
.card h2 { margin-top: 0; }
ul { margin: 0; padding-left: 20px; }
li { margin: 4px 0; }
a { color: var(--accent); }
footer { color: var(--muted); font-size: 0.9rem; margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--rule); }